Bolivia has a sorry record when it comes to highway safety, and crashes involving buses travelling at night are common.
Mexico has accused Bolivia of intimidating its diplomats in La Paz after a chill in relations since Mexican President Andres Manuel Lopez Obrador last month gave political asylum to former Bolivian president Evo Morales.
The announcement comes after the number of people killed in clashes with security forces at a fuel plant near La Paz on Tuesday rose to eight.
The country has been crippled by mass protests which erupted after the presidential election last month.
Interim interior minister says the number of trouble spots is "down by half," as six coca-growers' unions seek provisional leader Jeanine Anez's resignation "within 48 hours" and fresh elections within 90 days.
"Repressive actions by the authorities ... are likely to jeopardise any possible avenue for dialogue, UN High Commissioner for Human Rights Michelle Bachelet says, as supporters of ousted leader Evo Morales continue to agitate.
Evo Morales called for the UN, and possibly Pope Francis, to mediate the Andean nation’s political crisis following his ouster as president in what he called a coup d’etat that forced him into exile in Mexico.
Morales stepped down Sunday following weeks of massive protests over a disputed presidential election, but the resignations of every constitutionally designated successor left unclear who will take his place and how.
Gabriela Zapata was said to have used her influence to get contracts worth $560 million for a Chinese engineering company. Bolivia's congress ruled that Morales was not to blame.
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